horton



Patented Mar. 23, 1920.

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INVENTOR 4 5 ATTORNEYS UNITED STATES PATENT OFFICE.

ALLEN A. HORTON, 0F HIGHLAND PARK, MICHIGAN, ASSIGNOR TO BURROUGHS ADDING MACHINE COMPANY, OF DETROIT, MICHIGAN, A CORPORATION' OF MICHIGAN.

RECORDING MECHANISM. A

Specification of Letters latent.

Patented Mar. 23, 1920.

Original application filed July 31, 1911, Serial No. 641,455. Divided and this application filed February 28, 1916. Serial No. 80,901.

To all @07mm t may concern:

Be it known that I, ALLEN A. I-IonroN, a citizen of the United States, residing at I-Iighland Park, in the county of 'Viayn'e and State of Michigan, have invented a certain new and useful Improvement in l'ecording Mechanism, of which the 'following is a Specification.

This application is a division of my prior application tiled July 31, 1911, Serial No. 641,455, entitled Improvement in adding machines. The present invention relates to the printing or recording mechanism, and particularly to the means for retracting the types. It is common in adding and listing machines to employ a series of types -for each numeral order and to drive the types against the platen by hammers. It is desirable to provide for percussive action, and it is usual to project the type slightly beyond the position which would correspond to the actual stroke of the hammer. Ordinarily the hammers drive the type against light spring resistance, and the type recoil under their own spring action. The object of the present invention is to improve upon the familiar arrangement of `an individual spring for each type. My invention makes provision for the employment ot' a single spring to serve a complete series ot type. Provision is also made for a uniform spring resistance to the driving of each type ot' the series. l

In the drawing which accompanies and forms a part of this speciiication Figure 1 represents in the left side elevation the m terior mechanism of that portion of the adding and listing machine of my said prior application, which includes the parts d1 rectly concerned with the present invention. Fig. 2 represents one or the type carrying slide bars with the type housing in section; Fig. 3 is a similar view representing one ot the types projected; Figs. l and 5 are corresponding horizontal sections taken on lines d, 4land 5, 5 of Figs. 2 and 3.

The numeral d designates the casing. oi the adding machine which has an opening t" through which the type-carrying slide bars rise for the proper setting` of the types opposite the roller platen 13. Reference numeral 15 designates one of the type-carry ing slide bars of which a suitable number will be employed according to the denominational capacity of the machine. The upper part oit said slide bar is formed into a housing 15a for its series of types 16. The numeral 300 designates one of a series of hammers pivoted at 301 and driven by springs 302 under control oi tripping devices of the general character of those commonly used in machines of this class. Power is stored in said springs by retraction or the hammers as eltected by a bail, ong side piece of which is designated by the numeral 305, and the cross-rod oi which is designated by the numeral 3011. In operation of the machine the bail swings rearward and appropriate hammers are released and swung rearward by their springs, and they deliver blows upon the heads of such types as are in position at the printing line, with the result of' projecting those type as illustrated in Fig. 3. As there shown the type so operated upon is projected somewhat farther than as measured by the stroke of the hammer.

Recoil ot the type bars 16 after their projection by the hammers is ei'lected through the following described means: The said bars have a limited sliding movement through guiding openings in the housing 15, being limited by abutment et shoulders formed upon them against the exterior of said housing. These bars are formed with laterally projecting lugs 1Gat which are normally alined vertically in engagement with a retracting bar 16D. The latter is pivctally connected at its upper and lower eXtremities to upwardly projecting arms of a pair of bell crank levers 16C and 16d respectively. Itearwardly projecting arms of the bell cranks are connected together by a link 16e, and the lower' bell. crank lever has a torwardly projecting arm 16f which is connected by a spring 16g to a lower portion of the rack bar, F i g. 1. It will be seen that the above described construction is of parallelogram order calculated to secure a uniform action of the spring 16g against the type bars for holding them normally retracted. rIhe striking of the hammer against any one of the type bars projects the same against the platen in opposition to said spring, it being` understood that the hammer does not follow the type bar all the way, so that the desired pereussive action is had.

To assist in* keeping the bar 1Gb alined With the lugs of the type bars, and also to accommodate the structure to the limited lateral space Within the housing 15, said loar 16h is widened near its upper end and formed with an arc-shaped slot 16 to embrace the pivot stud of the upper bell crank 16 which stud is headed over the bar 16" as illustrated in Fig. 2.

Manifestly the character of the lever system may be modified Within the scope of the invention.

I claim:

l. In a recording machine, the combination of a type carrier, a series of type movably mounted thereon, a spring-held lever carried by said type carrier on a fixed pivot and holding said type retracted, and means for individually,projecting type in opposition to said lever.

2. In a recording machine, the combination of a type carrier, a series of type movably mounted thereon, a pair of spring-held levers carried by said type carrier on iixed pivots and holding said type retracted, and means for individually projecting the type in opposition to said levers.

3. In a recording` machine, the comloination with a type-carrier, a series of type supported by said type-carrier, and shoulders limiting movement of said type in both directions, of a lever pivoted on said typecarrier for holding said type in idle position, a spring acting on said lever to hold said type in idle position and to restore them to idle position after being driven to print,

and a hammer operable to drive said type to print, in opposition to said lever and spring.

4. ln a recording machine, the eonildira tion with a type-carrier, a series ot type snpported by said type-carrier, and shoulders limiting movement of said type in liotli directions, of a bell-crank lever pivoted on said type-carrier for holding said type in idle position, a spring acting on said lever to hold said type in idle position, and to restore them to idle position after lieing driven to print, and a hammer operable to drive said type to print, in opposition to said lever and spring.

5. In a machine of the character described, the combination of a type-carrier; type liars slidable therein; a retracting bar engaging said type bars; parallel motion links and levers connected to said har; and a spring applied to said links and levers.

G. In a machine of the character described, the combination oi' a type carrier; type lmrs slidable therein, a retrzwting har engaging said type bars; a pair oit hell-crank levers to corresponding arms oi which said retracting bar is connected; a link connecting other corresponding arms ot said hell-crank levers; and a spring applied to one of said levers.

ALLEN A. HORTON.

lVitnesses R. S. MIELERT, J. A. BRorHY.

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